[Intel-gfx] [PATCH] drm/i915: avoid concurrent writes to aux_inv
fei.yang at intel.com
fei.yang at intel.com
Mon Mar 28 03:16:07 UTC 2022
From: Fei Yang <fei.yang at intel.com>
GPU hangs have been observed when multiple engines write to the
same aux_inv register at the same time. To avoid this each engine
should only invalidate its own auxiliary table. The function
gen12_emit_flush_xcs() currently invalidate the auxiliary table for
all engines because the rq->engine is not necessarily the engine
eventually carrying out the request, and potentially the engine
could even be a virtual one (with engine->instance being -1).
With the MMIO remap feature, we can actually set bit 17 of MI_LRI
instruction and let the hardware to figure out the local aux_inv
register at runtime to avoid invalidating auxiliary table for all
engines.
Bspec: 45728
v2: Invalidate AUX table for indirect context as well.
Cc: Stuart Summers <stuart.summers at intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Signed-off-by: Chris Wilson <chris.p.wilson at intel.com>
Signed-off-by: Fei Yang <fei.yang at intel.com>
---
drivers/gpu/drm/i915/gt/gen8_engine_cs.c | 48 ++++----------------
drivers/gpu/drm/i915/gt/gen8_engine_cs.h | 4 +-
drivers/gpu/drm/i915/gt/intel_gpu_commands.h | 1 +
drivers/gpu/drm/i915/gt/intel_lrc.c | 12 +++++
4 files changed, 26 insertions(+), 39 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/gen8_engine_cs.c b/drivers/gpu/drm/i915/gt/gen8_engine_cs.c
index 36148887c699..8178be083b42 100644
--- a/drivers/gpu/drm/i915/gt/gen8_engine_cs.c
+++ b/drivers/gpu/drm/i915/gt/gen8_engine_cs.c
@@ -6,7 +6,6 @@
#include "gen8_engine_cs.h"
#include "i915_drv.h"
#include "intel_gpu_commands.h"
-#include "intel_gt_regs.h"
#include "intel_lrc.h"
#include "intel_ring.h"
@@ -165,33 +164,9 @@ static u32 preparser_disable(bool state)
return MI_ARB_CHECK | 1 << 8 | state;
}
-static i915_reg_t aux_inv_reg(const struct intel_engine_cs *engine)
+u32 *gen12_emit_aux_table_inv(const i915_reg_t inv_reg, u32 *cs)
{
- static const i915_reg_t vd[] = {
- GEN12_VD0_AUX_NV,
- GEN12_VD1_AUX_NV,
- GEN12_VD2_AUX_NV,
- GEN12_VD3_AUX_NV,
- };
-
- static const i915_reg_t ve[] = {
- GEN12_VE0_AUX_NV,
- GEN12_VE1_AUX_NV,
- };
-
- if (engine->class == VIDEO_DECODE_CLASS)
- return vd[engine->instance];
-
- if (engine->class == VIDEO_ENHANCEMENT_CLASS)
- return ve[engine->instance];
-
- GEM_BUG_ON("unknown aux_inv reg\n");
- return INVALID_MMIO_REG;
-}
-
-static u32 *gen12_emit_aux_table_inv(const i915_reg_t inv_reg, u32 *cs)
-{
- *cs++ = MI_LOAD_REGISTER_IMM(1);
+ *cs++ = MI_LOAD_REGISTER_IMM(1) | MI_LRI_MMIO_REMAP_EN;
*cs++ = i915_mmio_reg_offset(inv_reg);
*cs++ = AUX_INV;
*cs++ = MI_NOOP;
@@ -293,10 +268,12 @@ int gen12_emit_flush_xcs(struct i915_request *rq, u32 mode)
if (mode & EMIT_INVALIDATE) {
cmd += 2;
- if (!HAS_FLAT_CCS(rq->engine->i915)) {
+ if (!HAS_FLAT_CCS(rq->engine->i915) &&
+ (rq->engine->class == VIDEO_DECODE_CLASS ||
+ rq->engine->class == VIDEO_ENHANCEMENT_CLASS)) {
aux_inv = rq->engine->mask & ~BIT(BCS0);
if (aux_inv)
- cmd += 2 * hweight32(aux_inv) + 2;
+ cmd += 4;
}
}
@@ -329,15 +306,10 @@ int gen12_emit_flush_xcs(struct i915_request *rq, u32 mode)
*cs++ = 0; /* value */
if (aux_inv) { /* hsdes: 1809175790 */
- struct intel_engine_cs *engine;
- unsigned int tmp;
-
- *cs++ = MI_LOAD_REGISTER_IMM(hweight32(aux_inv));
- for_each_engine_masked(engine, rq->engine->gt, aux_inv, tmp) {
- *cs++ = i915_mmio_reg_offset(aux_inv_reg(engine));
- *cs++ = AUX_INV;
- }
- *cs++ = MI_NOOP;
+ if (rq->engine->class == VIDEO_DECODE_CLASS)
+ cs = gen12_emit_aux_table_inv(GEN12_VD0_AUX_NV, cs);
+ else
+ cs = gen12_emit_aux_table_inv(GEN12_VE0_AUX_NV, cs);
}
if (mode & EMIT_INVALIDATE)
diff --git a/drivers/gpu/drm/i915/gt/gen8_engine_cs.h b/drivers/gpu/drm/i915/gt/gen8_engine_cs.h
index cc6e21d3662a..94f589e73d10 100644
--- a/drivers/gpu/drm/i915/gt/gen8_engine_cs.h
+++ b/drivers/gpu/drm/i915/gt/gen8_engine_cs.h
@@ -10,7 +10,7 @@
#include <linux/types.h>
#include "i915_gem.h" /* GEM_BUG_ON */
-
+#include "intel_gt_regs.h"
#include "intel_gpu_commands.h"
struct i915_request;
@@ -38,6 +38,8 @@ u32 *gen8_emit_fini_breadcrumb_rcs(struct i915_request *rq, u32 *cs);
u32 *gen11_emit_fini_breadcrumb_rcs(struct i915_request *rq, u32 *cs);
u32 *gen12_emit_fini_breadcrumb_rcs(struct i915_request *rq, u32 *cs);
+u32 *gen12_emit_aux_table_inv(const i915_reg_t inv_reg, u32 *cs);
+
static inline u32 *
__gen8_emit_pipe_control(u32 *batch, u32 flags0, u32 flags1, u32 offset)
{
diff --git a/drivers/gpu/drm/i915/gt/intel_gpu_commands.h b/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
index d112ffd56418..4243be030bc1 100644
--- a/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
+++ b/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
@@ -144,6 +144,7 @@
#define MI_LOAD_REGISTER_IMM(x) MI_INSTR(0x22, 2*(x)-1)
/* Gen11+. addr = base + (ctx_restore ? offset & GENMASK(12,2) : offset) */
#define MI_LRI_LRM_CS_MMIO REG_BIT(19)
+#define MI_LRI_MMIO_REMAP_EN REG_BIT(17)
#define MI_LRI_FORCE_POSTED (1<<12)
#define MI_LOAD_REGISTER_IMM_MAX_REGS (126)
#define MI_STORE_REGISTER_MEM MI_INSTR(0x24, 1)
diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
index 07bef7128fdb..7581ef9e2cce 100644
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -1208,6 +1208,10 @@ gen12_emit_indirect_ctx_rcs(const struct intel_context *ce, u32 *cs)
IS_DG2_G11(ce->engine->i915))
cs = gen8_emit_pipe_control(cs, PIPE_CONTROL_INSTRUCTION_CACHE_INVALIDATE, 0);
+ /* hsdes: 1809175790 */
+ if (!HAS_FLAT_CCS(ce->engine->i915))
+ cs = gen12_emit_aux_table_inv(GEN12_GFX_CCS_AUX_NV, cs);
+
return cs;
}
@@ -1225,6 +1229,14 @@ gen12_emit_indirect_ctx_xcs(const struct intel_context *ce, u32 *cs)
PIPE_CONTROL_INSTRUCTION_CACHE_INVALIDATE,
0);
+ /* hsdes: 1809175790 */
+ if (!HAS_FLAT_CCS(ce->engine->i915)) {
+ if (ce->engine->class == VIDEO_DECODE_CLASS)
+ cs = gen12_emit_aux_table_inv(GEN12_VD0_AUX_NV, cs);
+ else if (ce->engine->class == VIDEO_ENHANCEMENT_CLASS)
+ cs = gen12_emit_aux_table_inv(GEN12_VE0_AUX_NV, cs);
+ }
+
return cs;
}
--
2.25.1
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